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Hillstones: from my experience using the Navi application. The app doesn't choose the logical route at a freeway junction. I'll try to give you an example . Forgive me if my freeway numbers or direction is off.
I was driving down the 215 freeway heading for upland. At some point the 60 runs side by side with the 215. The nav would keep telling me to get over to the right lane. Then once I did the lane wanted to exit the freeway. Then the nav says last minute to get over 1 lane . I make it back into the lane with an unsafe change. I follow the path and it puts me right back onto the 215 freeway.
IMO the app could just say stay in the left lanes since the 215 is where I'm going to direct you in just a moment.
Please keep in mind I have never been to upland so I was relying on gps to get me there. I just hope a patch works out a kink like this one